From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Rannaud Subject: Re: i915: Regression: +4W in idle power use on Macbook Pro 15 (late 2013) Date: Thu, 28 Aug 2014 10:19:05 -0700 Message-ID: References: <87vbpglvmu.fsf@intel.com> <87sikklvhu.fsf@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-wg0-f43.google.com (mail-wg0-f43.google.com [74.125.82.43]) by gabe.freedesktop.org (Postfix) with ESMTP id F00E96E023 for ; Thu, 28 Aug 2014 10:19:06 -0700 (PDT) Received: by mail-wg0-f43.google.com with SMTP id a1so1036449wgh.14 for ; Thu, 28 Aug 2014 10:19:05 -0700 (PDT) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Sean V Kelley Cc: Jani Nikula , Daniel Vetter , "intel-gfx@lists.freedesktop.org" , Greg Kroah-Hartman , Jon Kristensen List-Id: intel-gfx@lists.freedesktop.org On Thu, Aug 28, 2014 at 9:41 AM, Sean V Kelley wrote: > For what it's worth, I have a Mid-2014, Macbook Pro Retina (13inch display), > running Archlinux with 3.16. > > Definitely, enable_fbc is a win for me and I do manually enable it. But I > am still seeing what I believe to be > a regression overall of about +4W even with fbc enabled. Still digging for > clues. To be clear, because I don't think I listed that case, with 3.17.0-rc2-ARCH-00040-gff0c57ac7043 and i915.enable_fbc=1 the idle power consumption goes back down to under 7W, which is about back to normal. There does seem to be a roughly +500mW regression since 3.13, but it's a little hard to tell because of the sampling noise in the power information as reported by powertop. Is there a systematic, large-scale effort to obtain baseline power data over time on various configs?